Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

Crippling global sanctions are forcing Russia to turn to North Korea to secure ammunition and other vital supplies for its military, according to a newly declassified American intelligence report.

"The Russian Ministry of Defense is in the process of purchasing millions of rockets and artillery shells from North Korea for use on the battlefield in Ukraine," a U.S. official said in the report. "This purchase indicates that the Russian military continues to suffer from severe supply shortages in Ukraine, due in part to export controls and sanctions."

Given that Moscow has few viable trade partners, the official added that this could be a continuing trend.

This development, first reported by The New York Times, comes on the heels of Russia securing initial shipments of Iranian drones for use on the battlefield.

U.S. sources have released little information about the quality of the weapons from North Korea or when Russia expects to receive them, but sources within the administration said it's a sign of the Kremlin's desperation.

Sources also told ABC News that there's no indication so far that China played an indirect hand in the deal, but that they're continuing to monitor the situation closely.

-ABC News' Shannon K. Crawford

The Russian Ministry of Foreign Affairs on Monday imposed new sanctions on 25 Americans, including one of U.S. President Joe Biden's cabinet secretaries, several U.S. senators and two Hollywood actors, all of whom have been outspoken against Russia's war in neighboring Ukraine.

Commerce Secretary Gina Raimondo, Arizona Sens. Mark Kelly and Kyrsten Sinema, Sen. Rick Scott of Florida, Sen. Mike Rounds of South Dakota, Sen. Pat Toomey of Pennsylvania, Sen. Kevin Kramer of North Dakota, as well as actors Ben Stiller and Sean Penn, are banned from entering Russia.

"Through the Armed Services Committee I’ve worked with Republicans, Democrats, and our military leaders to get Ukraine the supplies and weapons needed to beat back this invasion," Kelly, who is up for re-election, said in a statement to ABC News on Tuesday. "If that earns me a sanction by the Kremlin, then that means we’re doing something right."

-ABC News' Libby Cathey

In an exclusive interview with ABC's "World News Tonight" anchor David Muir, Ukrainian President Volodymyr Zelenskyy hinted of more counteroffensives as his country tries to turn the tide of war against Russia.

"It's a very difficult war," Zelenskyy told Muir from the presidential office in Kyiv. "We will regain our territory."

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Zelenskyy signals to David Muir that Kherson is not only counteroffensive underwayUkrainian President Volodymyr Zelenskyy sat down with ABC News’ David Muir in Kyiv and addressed the new push against Russian forces.

ABCNews.com

Ukraine's Zaporizhzhya Nuclear Power Plant has lost connection to its last remaining main external power line, the International Atomic Energy Agency said in a statement Saturday.

Zaporizhzhya is continuing to supply electricity to the grid through a reserve line, the IAEA said it was informed while at the site.

Three other power lines were lost earlier during the conflict, the IAEA said.

The information came less than 48 hours after IAEA Director General Mariano Grossi established a presence in the plant.

One reactor is still operating and producing electricity both for cooling and other essential safety functions at the site and for households, factories and others through the grid, the IAEA said.

The power plant has been held by Russian forces since early March, but its Ukrainian staff are continuing to operate the plant.